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4 years ago

If a snack cake contains 450 food calories and Carla

Chemistry

1 answer:

Oksana_A [137]4 years ago

8 0

Answer:

9/10hr

Explanation:

From the question given:

Carla was able to burn 250 calories by running for one-half (1/2)hr.

Therefore, Carla will burn 450calories by running for = (450x1/2) /250 = 225/250 = 9/10hr

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Đốt cháy hoàn toàn một amin đơn chức thu được CO2 và H2O theo tỉ lệ nCO2 : nH2O = 6 : 7. Vậy CT amin đó là

Sav [38]

Câu trả lời là Anlyamin

7 0

3 years ago

KCl and KBr are both ionic solids. A mixture of KCl and KBr has a mass of 3.595 g. When this mixture is heated in the presence o

monitta

Answer:

The percentage (by mass) of KBr in the original mixture was 33.1%.

Explanation:

The mixture of KCl and KBr has a mass of 3.595g, thus the sum of the moles of KCl (<em>x</em>) multiplied by it molar mass (74.5g/mol) and the moles of KBr (<em>y</em>) multiplied by it molar mass (119g/mol) is the total mass of the mixture:

$x.74.5g/mol + y.119g/mol = 3.595g$

Also, after the conversion of KBr into KCl, the total mass of 3.129 g is only from KCl moles, hence

$\frac{3.129g}{74.5g/mol} = 0.042 moles$

But the 0.042 moles came from the originals KCl and KBr moles, thus

$x + y = 0.042moles$

Now it is possible to propose a system of equations:

$x.74.5g/mol + y.119g/mol = 3.595g$

$x + y = 0.042moles$

Solving the system of equations,

$x=0.032moles\\y=0.010 moles$

0.010 moles of KBr multiplied it molar mass is

$0.010molesx119g/mol = 1.19g$

Therefore, the percentage (by mass) of KBr in the original mixture was:

$\frac{1.19g}{3.595g}x100% = 33.1%$ %

4 0

3 years ago

Explain what happens when a cold air mass overtakes a warm air mass?

SVEN [57.7K]

Is this a multiple answer?

6 0

3 years ago

What is the concentration of Htions at a pH = 11?

Lostsunrise [7]

Answer:
a) 1 x 10^-11 mol/L
b) 1 x 10^-6 mol/L
c) 1 x 10^-5 fewer H+ ions

Explanation

pH stands for Power of Hydrogen, the more acidic a substance is, the more H+ ions it has rendering the substance acidic. a pH of 1 means the concentration of H+ ions is 1 x 10^-1. A pH of 7 means the concentration of H+ ions is 1 x 10^-7 and so on.

10^-11 has 10^-5 more H+ ions than 10^-6

Hope this helps :)

5 0

3 years ago

What is 2.75 mol of O2

ANTONII [103]

Answer:

2,75 mol of O2 it's 88 g of O2.

Explanation:

The weight of the diatomic molecule O2 is 32 g/mol. So considering that, you should multiply 2,75 mol · 32 = 88g :)

3 0

3 years ago